US Bridges

Nfa A178 over Calfkiller River

Good

White County, Tennessee · .1MI South of SR84 · Structure no. 930A1780001

Built
1985
40 years old
Condition
Good
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
143 ft
3 main spans
Daily traffic
110
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A178 over Calfkiller River is a prestressed concrete continuous stringer/multi-beam or girder carrying Nfa A178 over Calfkiller River in White County, Tennessee. It was built in 1985, so it is 40 years old, younger than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 110 vehicles a day, roughly 2% of them trucks, projected to reach 176 by 2042. The structure is 143 ft (43.6 m) long and 24 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

CarriesNfa A178
CrossesCalfkiller River
Location.1MI South of SR84
RouteCounty Highway 178
Coordinates36.01263, -85.35931
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.4 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, precast panels
Main spans3
Design loadH 10
Structure length143 ft (43.6 m)
Longest span47 ft (14.3 m)
Deck width24 ft (7.4 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2020)
Projected traffic176 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A178 over Calfkiller River built?

It was built in 1985, making it 40 years old in 2025.

What condition is Nfa A178 over Calfkiller River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2024.

How much traffic does Nfa A178 over Calfkiller River carry?

About 110 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A178 over Calfkiller River?

The structure is 143 ft (43.6 m) long with a longest span of 47 ft (14.3 m) and a deck 24 ft wide.

Who owns Nfa A178 over Calfkiller River?

It is owned by the County Highway Agency.